Electric current and it's effects

When current is switched 'on' of a bulb it converts _______ energy into _______ energy.

• Electrical, heat

• Electrical, light

• Electrical, mechanical

• Electrical, sound

The magnitude of magnetism produced by an electric current in a wire depends upon- (a) Increases with an increase in the strength of electric current (b) Decreases, as the distance from the wire increases

• Both a, b

• Only a

• Only b

• None

A common household device, that do not use an electromagnet in its working, is-

• The electric bell

• Geyser

• Telephone

• Loud speaker

When electric current flows through the metal filament of the bulb it gets heated to very high temperature and becomes______ hot and start emitting _______.

• White, light

• Red, light

• White, heat

• Red, heat

When electricity flows through heating coil it becomes ________ hot and gives out _______ energy, which is to put in practical use.

• Red, heat

• White, heat

• Red, light

• White, light

The most suitable material for making the core of an electromagnet is:

• Iron

• Aluminum

• Brass

• Steel

The magnetic effect of electric current was discovered by-

• Maxwell

• Darwin

• Oersted

• Newton

An ____________ behaves like a magnet when an electric current passes through it.

• electromagnet

• switch

• cell

• wire

1.An electric current can produce

• heating effect only.

• chemical effect only.

• magnetic effect only.

• chemical, heating, and magnetic effects.

The filament of A bulb, is a wire of

• High resistivity, low melting point

• Low resistivity, low melting point

• High resistivity, high melting point

• Low resistivity, high melting point